Fixed Tariff Ending Soon? What to Do Next

If your fixed energy tariff is coming to an end, what you do next can have a big impact on your bills.

Many households don’t realise that when a fixed deal ends, they’re usually moved automatically onto a more expensive tariff, often without taking any action themselves. Understanding your options before that happens can help you avoid overpaying.

The Short Answer

When your fixed tariff ends, you’ll usually be moved onto your supplier’s standard variable tariff, which is often more expensive.

You don’t have to accept it, but timing and choice matter.

What Happens When a Fixed Tariff Ends?

At the end of your fixed term, your supplier will normally:

• stop charging your fixed unit rates,
• move you onto a default or standard variable tariff,
• adjust your prices in line with the energy price cap.

These default tariffs are protected by the price cap set by Ofgem, but they are rarely the cheapest option available (learn more about how the energy price cap actually works).

When Should You Take Action?

You don’t need to wait until your tariff ends.

Most suppliers allow you to:

• switch tariffs up to 49 days before your fixed deal ends,
• lock in a new deal without exit fees during this window.

Leaving it until after your tariff ends can mean weeks or months of paying higher rates unnecessarily.

Should You Fix Again or Go Variable?

There’s no single right answer. It depends on price, not labels.

Fixing Again May Suit You If:

• you value price certainty,
• the fixed rate is close to (or below) current capped prices,
• you want predictable monthly payments.

Staying Variable May Suit You If:

• fixed deals are significantly more expensive,
• you expect prices to fall,
• you want flexibility with no exit fees.

What matters most is whether the price you’re being offered is fair, not whether the tariff is fixed or variable (learn more about fixed vs variable tariffs).

Common Mistakes to Avoid

• Letting the Tariff Roll Over Automatically - This is the most expensive mistake. Default tariffs are rarely good value long-term.
• Assuming the Price Cap Means “Cheap” - The price cap limits how high prices can go, it does not guarantee the best deal.
• Fixing Too Quickly Without Comparing - Some renewal offers look convenient but aren’t competitive.

What to Check Before Choosing Your Next Tariff

Before agreeing to anything, check:

• unit rates (pence per kWh),
• standing charges,
• contract length,
• exit fees,
• how the deal compares to similar households.

Small differences in unit rates can add up to hundreds of pounds over a year.

Could You Be Overpaying After Your Fix Ends?

Many households move from a fixed tariff onto a default deal and quietly overpay for months, sometimes years (learn more about why your energy bill might be high).

At ismybillfair, we help you compare what you’re paying against similar households, so you can see whether your post-fix tariff reflects fair pricing or inflated default rates. We will also offer you a better deal if there is one avaiable.

Before committing to your next deal, it’s worth checking.

Final Thoughts

A fixed tariff ending isn’t a crisis, but ignoring it can be costly.

Taking a few minutes to review your options before your deal ends can help you avoid unnecessary price rises and stay in control of your energy bills.

If you’re unsure how your bill is calculated, it may help to first understand what each part of your energy bill actually means.